I know. But I tend to treat these "as a black box."
If you have "a box" containing the ECU, the harness, and all the harness connectors that go to all the sensors, there are only so many "unknown" conductors. I'd agree if you think some of them could "trip you up." But you eliminate the ones you know, you research the ones you don't, and pretty soon you are down to a few unknown connections.
One big problem that seems to plague these, without "commercial help" are the security system that's (I'm told) interconnected with the column.